Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 13
Fig. 9—Ruling Pens with Wide Blades. The position in which a ruling pen should beheld when drawing lines perpendicular to the T-square is shown in Fig. 10. The drawing board … Fig. 10—Correct Manner of Holding a Ruling Pen. should be placed so as to permit the light to comefrom the upper left-hand comer, this position ofthe T-square and triangle will avoid any possibil- DRAFTING TOOLS 11 ity of the shadows of the T-square blade or tri-angle being cast on the lines to be…
Mechanical drawing · Machine design
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